As part of Cheech and Chong, the comic duo which rejoiced in a world of marijuana-smoking and ignorance, Mexican-American actor Cheech Marin, 55, and his partner Tommy Chong, were the counter-culture icons in the 70s and early 80s. The duo won a Grammy Award in 1973, put out records that went gold, and made six movies (which are now top weekend movie rentals). In 1984, the pair, which had met in a Canadian topless bar, split up. What happened? According to Marin, it